Castor (in astronomy)

The Columbia Encyclopedia, 6th ed.

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Castor (kăs´tər), bright star in the constellation Gemini; Bayer designation α Geminorum; 1992 position R.A. 7h34.1m, Dec. +31°54′. Slightly dimmer than Pollux, with which it forms the Twins, Castor has an apparent magnitude of 1.58, which still makes it one of the 25 brightest stars in the sky. Castor is actually a six-star system, being a visual triple each component of which is a binary star; the three components are an eclipsing binary and a pair of spectroscopic binaries. The two brightest components are white, main-sequence stars of spectral classes A1 and A5. The system is about 50 light-years distant.

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Castor

Cas·tor
/ ˈkastər/
1. Greek Mythol.
the twin brother of Pollux. See Dioscuri.
2. Astron.
the second brightest star in the constellation Gemini, close to Pollux. It is a multiple star system, the three components visible in a moderate telescope being close binaries.

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castor

castor 1 beaver, unctuous substance obtained from the beaver (used as a drug). XIV. — (O)F. or L. castor — Gr. kástōr. The history of the use of castor oil (XVIII) for the pale-yellow oil obtained from the seeds of the plant Ricinus communis is obscure.

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